Fluid dispensing apparatus



Jan. 9, 1951 D. s. WILLSON FLUID DISPENSING APPARATUS 2 Sheets-Sheet 1 Filed June 30, 1944 FIG I Patented Jan. 9, 1951 UNITED STATES PATENT OFFICE signor to John Wood Manufacturing Company, Inc., Philadelphia, Pa., a. corporation of Delaware ApplicatinJ une30, 1944, Serial No. 543,019

8 Claims. 1

My invention relates to devices for controlling the delivery of air under pressure in pulsations from a source of supply of compressed air to a receiver, for example, to an automobile tire. My invention includes means to variably predetermine the pressure to which the receiver is to be inflated and to automatically shut off the delivery of air to the receiver when the pressure in the receiver reaches the predetermined pressure. My invention relates to apparatus of the general type shown. in Letters Patentof the United States No. 2,307,314 granted to me January 5, 1943, for improvement in. Fluid Dispensing Apparatus.

One feature of my invention is that in my improved device a single valve having sections of difierent diameters performs the dual functions of the adjustable needle valve and the inflating control valve in devices of the general type disclosed in: myPatent No. 2,307,314.

Another feature of my invention. is that my improved valve structure socontrols the air that at no time is it free to bypass directly'from the inlet side of the inflating device to the outlet passages.

Aother feature of my invention is: that my improved valve structure is operatively connected torthe snap actionxmechanism of the device.

My invention includes the various novel features of construction and arrangementhereinafter more definitely specified.

Fig; I is an end elevation of a tire inflating device embodying my invention.

' Fig. 11 is a vertical sectional view, partly in elevation, of the structure shown in Fig. I, taken on the lines I-I-II in Fig. I.

Fig. III is a fragmentaryvertical sectional view taken on the lines III-III iii-Fig. I.

Fig. IV is a fragmentary vertical sectional view taken on the lines IV-IV in Fig. I.

Fig. V is an enlarged view of the inflating control valve shown in Figs. II and III.

Fig. VI is an enlarged plan view of the check and timer valve shown in Fig. IV.

Fig. VII is-avertical sectional view of the check andtimer valve showninFig. VI.

Fig. VIII is an enlarged plan view of the main valve shown in Figs. II. and III.

Figisa fragmentary elevation of the valve shown. in- Fig. VIII.

Referring to saidrdrawingspa-scurce of air under. high pressure, say 125 to 150 pounds per square inch is connected by suitable piping and fittings to the screw threaded air inlet. port 2 formed in the body casing 3 of my improved tire infiator. The air inlet port 2 is in communication with the air passageway 4 which is in communication with the air passageway 5 leading to the chamber 6. The chamber 6 is provided with the air outlet passageway I under control of the main valve 9 which is arranged to control communication between said chamber 6 and outlet passageway 1. Communication between said chamber 6 and passageway I is shut off by a seating of the valve 9 on its valve seat Ill formed at the left-hand end of said passageway l, as viewed in Fig. II.

The valve 9 is provided with a reduced screw threaded stem portion [2 which extends through an opening formed in the spring loaded diaphragm Hi. The valve 9 is rigidly fastened to and carried by said diaphragm l3 by means of the nut M which engages the screw threaded stem H! of the valve 9. Flexing of the diaphragm 13, as hereinafter described, moves the valve 9 in its guide way I5 which afiords communication between the passageway I and chamber 6.

The outer portion of the diaphragm I3 is clamped between the casing 3 and the main valve cover 56, conveniently by a series of screws I? which extend through matching holes in the cover l5 and diaphragm l3 into engagement with screw threaded openings formed in said casing 3. The chamber 5 provided in the casing 3 permits flexing movement of that portion of the diaphragm 13 extending across the left-hand end of saidchamber 6, as viewed in Fig. II.

The main valve cover I6 is provided with the axially aligned annular recesses 2E) and 2|, the latter being smaller in diameter than the recess 2i], thus forming the shoulder 23 which acts as an abutment to limit the movement to" the left, as viewed in Fig. II, of the stop plate 251'. Said stop plate 25 is carried by the screw threaded valve stem 12 and rigidly mounted thereon between the diaphragm l3 and nut M, by means of which the valve 9 is rigidly fastened to said diaphragm l3.

Said diaphragm I3 is spring loaded by means of the coiled spring 26 located in the annular recesses 26 and 21. The right-hand end of said spring 25 is seated on the stop plate 25, connected to said diaphragm l3, and the opposite end of sad spring 26 is seated in the disc 21 which is positioned in said recess 2!, with the walls of said recess 2i acting as a guide for said disc 21. Said spring 25 is arranged to be adjusted manually by means of the adjustingscrew 30, the right-hand portion of Whichtends through a screw threaded opening formed in the main valve cover it and into engagement with the left-hand side of the disc 2?. Said adjusting screw 38 is locked in adjusted position by means of the lock nut 35, and the outer end of said screw Bil is provided with the slot 32 for conveniently effecting adjusting movement of said screw.

The main valve cover if is protected conven iently by means of the cap which is in screw threaded engagement at 36 with the screw thread formed on the reduce-cl left-hand end portion of said main valve cover it.

As best shown in Figs. I and IV, the air outlet passageway l is in open communication with the air outlet port Ell through the open connecting passage 39. The outer end of the outlet port 31 is screw threaded for connection by convenient means to the dispensing hose 4twhich carries at its distal end an air chuck d! of the well known conventional type, including a valve which is maintained closed by air pressure in the hose 48 and which valve is adapted to be opened by the operator pressing the chuck against the ordinary valve stem of an automobile tire.

As best shown in Fig. II, the casing 3 has formed therein the main diaphragm chamber 45. The right-hand end of said casing is provided with the circular flange outer portion of the main diaphragm is clamped between the flange 46 and the diaphragm chamber closure cover ts, conveniently means of a series of screws 59 which extend through matching holes in said flange it and diaphragm i? into engagement with screw threaded openings formed in said cover The reciprocatory diaphragm follower plate assembly includes the pressure disc 52, and the follower plate disc 53 which is interposed between the diaphragm 3? and the diaphragm chamber cover :29. Said diaphragm follower plate assembly includes the axial stud 52' in integral relation with the pressure disc 52, and said axial stud extends through the bearing guide 55 formed in the cover plate Said pressure disc and follower plate 53 are maintained on opposite sides of the diaphragm ll, and in rigid relationship therewith, by means of the nut 55 in engagement with the screw threaded portion of the stud 52.

The roller lever 5? is pivotally mounted in the diaphragm chamber 45 on the pivot 58. Said roller lever El has the limits of its counterclockwise movement on its pivot 58 fixed by means of the stop stud 8Q. Said pressure disc 52 is pro-- vided with the r duced stem portion 8! which is pivotally connected at with the rolier lever 5?. Accordingly, clockwise movement of the roller lever El is limited by the disc 53 coming into engagement with the diaphragm chamber cover 49.

The upper end of the roller lever is bifurcated and carries between its bifurcated arms the roller 33 which is mounted with freedom oi rotation on the pin t l, the opposite ends of which are fixed in the bifurcated portion of the roller lever 51.

The lever 55 is pivotally mounted in the diaphragm chamber 15 on the pivot 8'3. Said lever 65 is provided with the adjustable stop screw 68 rigidly connected with the lever 55 by means of the nut 69. Clockwise movement of the lever $5 is limited by the left-hand end of the stop screw 88 coming into engagement with the side wall of said diaphragm chamber as indicated in dotted lines in Fig. 11. Counter-clockwise movement of the lever 65 is limited by the lower end of the lever 85 coming into engagement with the left-hand end of the adjustable stop screw 10 which is in screw threaded engagement with a screw threaded opening in the projection 72 of the casing 3. Said screw i8 is maintained in adjusted position by means of its lock nut 13.

Pivoted to the upper end of the lever 65, as at 15, are a pair of links '56, only one of which is shown, and the lever 85 is provided with the hole 11. The pin 18, of substantially smaller diameter than the hole H, is pivoted to the arm and projects through said hole Tl, the periphery of which acts as a stop for limiting the pivotal movement of the links it.

The right hand end of the arm 8t extends through the opening formed by the bifurcated arms of the roller lever 5'1. The lower righ hand end of the arm 88 is provided with the V-shaped point 8! which is arranged to co-act with the roller 63 carried by the roller lever 51. The spring 82 is fastened at its upper end to the arm 88, through an opening 83 in said arm 80. The lower end of said spring 82 encircles and engages the screw 18 fixed in the projection 12 extending into the diaphragm chamber 45. The spring 82 yie-dingly holds the arm 8% in engagement with the roller $3, and also moves he arm 38 lengthwise as provided for by the structure and mounting of the links '56, as is hereinafter described.

The snap action linkage mechanism including the roller lever 57, lever 65, links 16, arm 80, etc., is of the same general construction as disclosed in my co-pending application Serial No.

r 536,497, and such linkage connection is old in the art and described in detail in Penn Patent No. Re. 19,201 dated June 5, 1934.

The lever 85 which is fulcrumed on the shaft 36 in bearings 8'! (only one of which is shown in Fig. II) formed on the cover closure 49, is in cooperating relation at its lower end with the axial stud 52 of the diaphragm follower plate assembly. Counter-clockwise movement of the lever 85 is limited by the projection 88 of the lever 85 coming into engagement with the cover 49. The upper end of said lever 85 is connected with the right-hand end of the spring 89. The left-hand end of the spring 89 is connected with the screw bolt shaft 96 which extends through an opening 9! in the outer casing 92 and is engaged by the tubular screw threaded sleeve 93 provided at its outer end with the crank handle 94.

Tension of the spring 89 may be increased or decreased by rotation of the crank handle 94. That is to say, the stress of the spring 89 may be increased by turning said crank 94 clockwise, or decreased by turning said crank 94 counterclockwise. I find it convei U cunnect said screw bolt shaft fill with indicating means for indicating in pounds by means of a pointer 95 and dial 95, the pressure of fluid to be dispensed for which said spring 89 is adjusted. Any convenient means may be used for connecting the pointer 95 with the shaft so, for example, such means as are disclosed in detail in Manson Patent Re. 18,483. The outer casing 92 is rigidly secured to the casing 3 conveniently by means of the screws 91.

As shown in Fig. IV; the air outlet port passageway 31 is in continuous direct communication with the lateral passageway 98 which has the vertical branch passageway lcfl in which is located the check and timer valve l0l. Said check and timer valve I0| is rectangular in cross section and mounted with freedom of reciprocatory movement in the circular tube bearing I92 which is pushfitted into the vertical branch passageway I00. The upper end of said tube bearing I92 is closed except for the restricted axial opening I93, which opens into the diaphragm chamber 45. The lower end of said tube hearing IE2 is closed by the plug I95 which has the restricted axial opening I95 therethrough.

As'best shown in Fig. VII on an enlarged scale; the check and timer valve I9I is hollow and open at its lower end and has a rounded upper end portion I96 which is closed except for an axial restricted bleed opening It! therethrough to afford continuous restricted communication between the diaphragm chamber t5 and the lateral passageway 99 when said rounded upper end I05 of the check and timer valve IIII is seated against the restricted co-axial opening I03 of the tube bearing I92. Said timer valve IDI, tube bearing I92 and plug I95 are assembled in the branch passageway I99 through the screw threaded opening I99 formed in the casing 3 and thereafter said opening I99 is closed by means of the screw threaded plug H9.

As best shown in Figs. III and II; communication between the chamber recesses and 2I, formed at the left-hand side of the diaphragm I3, and main diaphragm chamber is arranged to be effected through the communicating air passageways H2, H9, H4, H5, H9 and III. The inflating control valve II9 is pivotally connected at II9 to the lower end of the lever 55, and said valve H9 is mounted with freedom of reciprocatory motion in the air passageway H5 which I acts as a bearing guideway for said valve.

As best shown in Fig. V; the valve I It has at the left-hand end thereof the enlarged portion I29; the intermediate reduced diameter portions I2l and I22; and the enlarged portion I23 at the A right-hand end. The reduced portion I2I is of smallest diameter, and the reduced portion I22 is of larger diameter than the reduced portion but said I2? is of smaller diameter d portions I29 and I229. The en- 29 and I29 are of the same di-- The enlarged portions I29 and I23 of the valve II9 fit the air passageway I I5 closely so as to effectually prevent passage of air around and between the enlarged portions I 29 and I23 and the passageway H5. Of course, the portions I29 and I23 are of slightly less diameter than the diameter of the passageway II 5 so as to permit reciprocatory movement of the valve I I9 in the passageway H5.

When the valve H9 is in the position shown in full lines in Fig. III, communication between the recess chambers 29 and ill (at the left-hand side of the diaphragm I9) and the chamber 5 (at the right-hand side of the diaphragm I3) is effected through the communicating passageways H2, H3, II4, around the reduced portions I2I and I22 in the passageway H5, passageway 4, passageway 5 to the chamber 6. When the valve I I9 is in the position shown in dotted lines in Fig. III, communication between the recess chambers 29 and 2I (at the left-hand side of the chamber I3) and the main diaphragm chamber 45 is eifected through the communicating pas sageways II2, H3, H4, around the reduced por tion I2I, in the passageway H5, passageway H6 and passageway II'I leading into said main diaphragm chamber 45.

When the valve I I9 is in the position asshown in full lines in Fig; III; the enlarged portion I29 of the valve H9 effectively cuts off passage of' air between the passageways I'I4and I-I'B. When the valve is in the position indicatedindotted lines in Fig. III, the enlarged portion I23 ofthe valve I'I9 effectively cuts off passage of airbetween the passageways H4 and 4.

I find it convenient to provide a communicating passageway I25 between the left-hand ends of the passageways H5 and III to prevent the valve II9 from trapping and compressing air' in the left-hand end of the passageway I I5, assuch trapped and compressed air might prevent the free movement of the valve H9 through its full stroke operation.

Operation My improved tire inflating apparatus operates as follows:

At. the end of a preceding inflating operation after a tire has been filled with air to the set pressure, the lever is in the position shown in Fig. II, with the diaphragm 4? moved to the right, as shown. The snap action mechanism and the valve I I9, pivotally connected to the lower end of the lever 65, are in the position shown in full lines in Fig. II. With the valve H9 in the position as shownin Fig. II, the chambers 20 and 2I at the left-hand side of the diaphragm I3 are in communication with the inlet passageway 4, which is continuously openly connected to the source of air under high pressure. Such communication is effected through the passageways H2, H3, H4, passageway I I5 around the reduced portions I2I and I22 of the valve H9, and to the passageway 4'. Said passageway 4 is in continuous open communication, through the open passageway 5, with the chamber I5 at the right-hand side of the diaphragm I 3. Air pressure being equalized on opposite sides of the diaphragm I3, the main valve 9 is maintained closed by the effective forces of the spring 26 and said main valve 9 and diaphragm I3 are in the position shown in Fig. II. Soon after the end of a cycle of operation, the check and timer valve I9l drops by gravity from the position shown in Fig. IV to a position in which the lower end of the valve IIII is resting on the upper surface of the plug I05.

Assuming. that it is desired to inflate an automobile tire to a pressure of 30 pounds per square inch,.the operator turns the crank 94 to move the indicating pointer.95 to the numeral 30 appearing on the face of the dial 96. The operator then presses the air chuck ll upon the stem. of the automobile tire which opens the tire valve and likewise moves the valve in the air chuck to open position against the air pressure in the hose 40. Ifthepressure in the tire is below the set pressure of 30 pounds, the air under high pressure in the hose 49, air passageways 91 and 98, and diaphragm chamber 45 tends to equalize with the pressure in the tire, thereby reducing the pressure in the chamber 45. Air flows comparatively rapidly and freely from the diaphragm chamber 45 through the opening I03, through and'around the timer and check valve IOI, through the axial opening I to the air passageway 93 and thence through the passageway 31, hose 40, etc., to the tire.

When the air pressure in the diaphragm chamber 45 is. reduced to a point where such pressure no longer can overcome the effective forces of the spring 89, the spring 89 moves the lever 85 counter-clockwise on its pivot 86. Such. counter.- clockwise movement of thelever 85 moves the axial stud 52' and pressure disc 52 etc. to the left;

The pressure disc 52 being pivotally connected to the roller lever 51, such movement to the left causes the roller lever to be moved counterclockwise about its pivot 58. Counter-clockwise movement of the roller lever 5'? moves the roller 63 beneath the crest of the V-point 8| of the arm 80. As the roller 63 passes beneath the crest of the V-point 8|, the spring 82 causes the arm 80 to move downwardly and to the right with a snap action, and the roller lever 57 and arm 8!] are moved from the position shown in full lines to the position shown in dotted lines in Fig. II. Such snap action movement is transmitted to the arm 65 through the links 16 and pin 18, thus causing the lever 65 to be moved clockwise from the position shown in full lines to the position shown in dotted lines in Fig. II. Clockwise movement of the lever 65 is limited by the stop screw 68 coming into engagement with the side wall of the casing 45. The snap action linkage connection above described is old in the art and disclosed in detail in Penn Patent No. Re. 19,201.

An emergency stop stud 60 has been provided in the casing 15 for engagement with the upper left-hand corner of the roller lever 57 to prevent any collapsing of the mechanism which might occur if there was no air pressure inside the diaphragm chamber 55, in which case, the arm 80 with its spring load on the roller 63 might pull the diaphragm 47 to an abnormal far position to the left. Accordingly, counter-clockwise movement of the lever 5'! would be arrested by the upper end of the lever 57 coming into engagement with the stop stud 6! only when there is a small amount of pressure or no pressure in the diaphragm chamber 45.

Such snap action movement of the lever 65 from the position shown in full lines in Fig. 11 to the position shown in dotted lines therein causes snap movement of the valve H9 in the air passageway H5 from the position shown in full lines in Fig. III to the position indicated in dotted lines. When the valve H9 is moved to the position indicated in dotted lines in Fig. III, the reduced portion E2! of the valve H9 is so positioned in the air passageway H5 as to permit the passage of air between the passageways H t and lit. With communication between the passageways 5M and H8 Opened, air flows from the chambers 29 and 2! through the air passageways HZ, ill-'3, H4, passageway its around the reduced portion l2l, passageway H6 and passageway ii? to the main diaphragm chamber 65. Such reduction of pressure in the chambers 28 and 2 i, at the left-hand side of the diaphragm I3, results in the high pressure in the chamber E, at the opposite side of the diaphragm [3, overbalancing the effective forces of the spring 25 and causes the valve 9 to be opened wide.

When the main valve 9 is opened, air under high pressure from the source flows through the air inlet port 2, passageway i, chamber 6, past the open valve 9, to the air outlet passageway 1, and thence through the passageway 39 to the air outlet port 3?, dispensing hose it and open air chuck 4! to the open valve stem of the automobile tire. The air under high pressure also simultaneously flows through the lateral passageway 98, opening 35' in the plug E05, and causes the check and timer valve tilt to be moved upwardly with its rounded end portion Hi5 seated against the upper end of the bearing tube H12. A restricted amount of high pressure air passes through the bleed opening it? in the check and timer valve ltl and through the co-axial opening H13 in the tube bearing H32 into the main diaphragm chamber 45.

Because the air under high pressure is admitted slowly to the diaphragm chamber 65 through the restricted openings W5, HEW, and I03, approximately one or two pounds of air is supplied to the tire before the pressure in the diaphragm chamber "it? becomes great enough to cause the diaphragm ii to move to the right to the position shown in Fig. II against the tension of the spring 39. When the diaphragm moves to the right to the position shown in Fig. II, such movement causes the roller lever 57 to be moved clockwise, thus moving the roller E3 down the left-inclined face of the arm 89 and past the crest of the V- point 35. As the roller moves past the crest of the V-point 8i, the spring 82 moves the arm to the left with a snap action, which snap action movement, through the linkage I6 and pin 18, is transmitted to the lever 65, causing said lever 55 to be snapped counter-clockwise from the position shown in dotted lines in Fig. II to the position shown in full lines. Counter-clockwise movement of the lever 65 is limited by the lower end of the lever 55 coming into engagement with the ler't hand end of the stop screw 18.

Such counter-clockwise movement of the lever 55 moves the valve its from the position shown in dotted lines in Fig. III to the position shown in full lines. W hen the valve 1 I9 is moved to the position shown in full lines, the enlarged portion 5% is positioned in the passageway H5 between the passageways lit and i 56, thereby effectually cutting off passage of air between said passageways iii and Mt. Communication is again effected between the chambers 25 and 2| and the inlet passageway t which, as stated above, is continuously openly connected to the source of air under high pressure. Such communication is eifected through the passageways IE2, H3, H4, passageway E55 around the reduced portions PH and H2 or" the valve H9, and. to the passageway 5. When the high pressure air, passing comparatively slowly from the passageway d to the chambers 2 and it, has increased the pressure in the chambers 2t and 2i to a value approaching that of the pressure oi air in the chamber (i, the effective forces of the spring 25 begin to move the valve 9 toward closed. position, and when the pressures in the chambers 29 and 2! and chamber ii, on opposite sides of the diaphragm [3, are nearly equalized, the valve 9 is seated. The inlet air pressure on the area of the valve 9 then adds to the force of the spring 25 to maintain the valve ii in closed position.

The pressure of air in the diaphragm chamber 25 again tends to equalize with the pressure in the tire, or receiver, by flowing through the passageways E93, W5, :38, 3?, hose 18, etc., as described above, and if the pressure in the receiver has not yet reached that to which the device is set, the effective force of the spring 89 will again move the lever 85 counter-clockwise to again move the diaphragm i? to the left which again causes an opening of the main valve 9 to allow another surge of air to flow to the r ceiver, as described above.

However, when the pressure in the receiver reaches the pressure for which the device is adjusted, the pressure in the diaphragm chamber 35 is sufficient to retain the lever 85 in th position shown in full lines in Fig. II and in which the diaphragm ll is moved to the right, and, accordingly, the main valve 53 remains closed. Thereupon, the operator removes the air chuck 4i accuses from the :stem of the tire an'dithe iairunder high pressure in the hose' w holds the valve of theair chuck closed. Of course; when the air chuck .is removed from the valve stem of the automohile tire, the spring of -the valve therein moves that valve to closed position and retains the desiredset pressure of air in the tire.

It is obvious that various modifications may be made in my invention Without departing from the essential features thereof as defined in the appended claims and, therefore, I do not desire to limit myself to the precis details of construction and arrangement hereinabove set forth.

Iiclaiml:

1. In fluid dispensing apparatus; the combination of afirst conduit adapted for connection with a source of fluid under pressure; a second con duit adapted for connection with a receiver; a diaphragm; a main valve, carried by said diaphragm, between said firstand second conduits; 2a .first diaphragm chamber at one side of said diaphragm; a second diaphragm chamber at the opposite side of said diaphragm; a main diaphragm chamber, including a main diaphragm; loading means for said main diaphragm; a snap action mechanism :operatively connected to said main diaphragm; conduit means arranged to connect said first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; and valve means :connected to said snap action mechanism and arranged to selectively control the flow of fluid through both oftsaid conduit means.

"2. In fluid dispensing apparatus; the combination of a first conduit adapted for connection with a source of fluid under pressure; a second conduit adapted for connection with a receiver; a diaphragm; a main valve, carried by said diaphragm, between said first and second conduits; a first diaphragm chamber at one side of said diaphragm; a second diaphragm chamber at the opposite side of said diaphragm; a main diaphragm chamber, including a main diaphragm;

loading means for said main diaphragm; a snap action mechanism in said main diaphragm chamber and operatively connected to said main diaphragm; conduit means arranged to connect said first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; and reciprocatory valve means connected to said snap action mechanism and arranged to selectively control the flow of fluid through both of said conduit means.

3. In fluid dispensing apparatus; the combination of a first conduit adapted for connection with a source of fluid under pressure; a second conduit adapted for connection with a receiver; a diaphragm; a main valve, carried by said diaphragm, between said first and second conduits; a first diaphragm chamber at one side of said diaphragm; a second diaphragm chamber at the opposite side of said diaphragm; a main diaphragm chamber, including a main diaphragm; loading means for said main diaphragm; a snap action mechanism in said main diaphragm chamber and operatively connected to said main diaphragm; conduit means arranged to connect said first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; and a reciprocatory valve connected to said snap action mechanism and arranged to selectively control the flow of fluid through: both of said conduit means, said valve'including an intermediate reduced portion.

4. In fluid dispensing apparatus; the combination of a first conduit adapted for connection with a source of fluid under pressure; a second conduit adapted for connection with a receiver; a diaphragm; a main valve, carried by said diaphragm, between said first and second conduits; a first diaphragm chamber at one side of said diaphragm; a second diaphragm chamber atthe opposite side of said diaphragm; a main diaphragm chamber, including a main diaphragm; loading means for said main diaphragm; a snap action mechanism insaid main diaphragm chamber and operatively connected to said main diaphragm; conduit means arranged to connect said first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; a conduit passageway common to both of said conduit means; and valve mean connected to said snap action mechanism and arranged to operate in said conduit passageway to selectively control the flow of fluid through both of said conduit means.

5. In fluid dispensing apparatus; the combination of a first conduit adapted for connection with a source of fluid under pressure; a second conduit adapted for connection with a receiver; a diaphragm; a main valve, carried by: said diaphragm, between said first and second conduits; a first diaphragm chamber at one side of said dia hragm; a second diaphragm chamber at'the "opposite side of said diaphragm; a main diaphragm chamber, including a main diaphragm; loading means for said main diaphragm; a snap action mechanism in saidm ain diaphragm chamber and operatively"connected to said main diaphragm; conduit means arranged to connec'tsaid first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; a conduit passageway common to both of said conduit means; and reciprocatory valve means connected to said snap action mechanism and arranged to operate in said conduit passageway to selectively control the flow of fluid through both of said conduit means.

6. In fiuid dispensing apparatus; the combination of afirst conduit adapted for connection with a source of fluid under pressure; a second conduit adapted for connection with a receiver; a diaphragm; a main valve, carried by said diaphragm, between said first and second conduits; a first diaphragm chamber at one side of said diaphragm; a second diaphragm chamber at the opposite side of said diaphragm; a main diaphragm chamber, including a main diaphragm; loading means for said main diaphragm; a snap action mechanism in said main diaphragm chamber and operatively connected to said main diaphragm; conduit means arranged to connect said first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; a conduit passageway common to both of said conduit means; and a reciprocatory valve connected to said snap action mechanism and arranged to operate in said conduit passageway to selectively control the flow of fluid through both of said conduit means, said valve including an intermediate reduced portion.

7. In fluid dispensing apparatus; the combination of a first conduit adapted for connection diaphragm; conduit means arranged to connect said first diaphragm chamber with said main diaphragm chamber; conduit means arranged to connect said first diaphragm chamber with said second diaphragm chamber; a conduit passageway common to both of said conduit means; and a reciprocatory valve pivotally connected to said snap action mechanism and arranged to operate in said conduit passageway to selectively control the flow of fluid through both of said conduit means, said valve including enlarged end portions and two intermediate reduced portions, one of said intermediate portions being of lesser diameter than the other and both of said in- 'termediate reduced portions being of less diameter than said end portions; whereby, when said valve is at one end of its stroke in said conduit passageway, fluid is free to flow from said first diaphragm chamber to said main diaphragm chamber and prevented from flowing from said first diaphragm chamber to said second diaphragm chamber; and when said valve is at the opposite end of its stroke in said conduit passageway, fluid is free to flow from the said first diaphragm chamber to said second diaphragm chamber and prevented from flowing from said first diaphragm chamber to said main diaphragm chamber.

in said main diaphragm chamber and operatively connected to said main 8. In fluid dispensin apparatus; the combination of a first conduit means adapted for connection with a source of fluid under pressure; a second conduit means adapted for connection with a receiver; a main valve controlling the flow of fluid from said first conduit means to said second conduit means; a first chamber and a second chamber separated by a movable element adapted to control said main valve, said second chamber communicating with said first conduit means; a third chamber, including a pressure sensitive element; loading means for said pressure sensitive element; a snap action mechanism controlled by said pressure sensitive element; a third conduit means arranged to connect said first chamber with said second chamber; a fourth conduit means arranged to connect said first chamber with said third chamber; and valve means controlled by said snap action mechanism and arranged to selectively control the flow of fluid through said third and fourth conduit means.

DAVID S. WILLSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 19,201 Penn June 5, 1934 1,231,280 Metten June 26, 1917 1,632,619 Morley June 14, 1927 2,047,581 Grissett July 14, 1936 2,104,934 Smith Jan. 11, 1938 2,217,288 Morley 1 Oct. 8, 1938 2,307,314 Willson June 5, 1943 

